Can you give me an overview of the use and principle of the autocorrelator, thank you

Updated on amusement 2024-08-04
13 answers
  1. Anonymous users2024-02-15

    It turned out to be a McKelson interferometer, which creates a time difference by having two identical pulses.

    The two pulses interact with each other in the frequency-doubling crystal to produce a frequency doubling, so that the autocorrelation function of a pulse is calculated.

    It is mainly used to measure the pulse duration, that is, the pulse width.

    Since you are new to the field of optics, I suggest that you check the literature by yourself, instead of asking questions, of course, you can ask small questions, and look at the literature for big questions! Good for you! In addition, the optical path diagram of the autocorrelation instrument made by APE is attached!

  2. Anonymous users2024-02-14

    Autocorrelator is an advanced technology for measuring pulse width, which has the advantages of high resolution, high sensitivity, and ease of use. The principle of the autocorrelation meter is to use the scanning autocorrelation meter to measure the autocorrelation meter of ps and S, and by turning the time quantity of the laser into a spatial quantity, that is, the measurement of time into the measurement of length. Then, the pulsed laser is divided into two beams with a beamsplitter of 50 50, and the lens group is used to introduce a delay in one beam of light, and then the two beams of light are combined, so that one laser scans the other beam of light, so that the combined laser produces a nonlinear effect through the nonlinear crystal, or directly adopts TPA absorption measurement, and then receives it by the oscilloscope, so that the pulse width information of the laser pulse can be obtained.

  3. Anonymous users2024-02-13

    APE's autocorrelator is not easy to use, it is recommended that you can take a look at the autocorrelator of the American Femtochrome company, like FR-103XL is easier to use, and the principle is also Michelson interferometer.

    If you are interested, you can contact Beijing Bowei Technology****, they have special engineers who can provide installation, commissioning and technical training.

    We bought APE's autocorrelator before, but no one will use it, and the first business will not, so we don't care in the end, and then we still contacted Beijing Bowei to buy FR-103XL, Their engineers are very skilled, and they have adjusted it for us on site, and there is detailed technical training.

    Hopefully so.

  4. Anonymous users2024-02-12

    There is no answer to this question at the moment.

    Now it's a bug

    Whatever the answer is, it's not true.

    Someone consulted customer service.

    He said he wouldn't answer for the time being.

  5. Anonymous users2024-02-11

    It should be the last letter that you don't know much about.

    Enter (i i n e).

    Satisfied!

  6. Anonymous users2024-02-10

    How the conjugate cam works:

    It is through two cams to control a follower at the same time, so that the freedom of both directions from the follower is restricted, so the two cams of the conjugation must strictly ensure that one advances and one retreats, you retreat and I advance, otherwise the mechanism will be stuck or damaged.

    Advantages and disadvantages of conjugate cams.

    Advantages: The movement law of the follower is not limited and can be selected arbitrarily within the 360 range.

    Disadvantages: The structure is more complicated.

    The conjugate cam mechanism is a key component in mechanization and automation production equipment, which is widely used in the intermittent indexing of various automatic machinery and the stepping conveying mechanism of automatic production lines.

  7. Anonymous users2024-02-09

    This reason is very simple, that is, the lift and return are controlled by cams, and the transmission is accurate, but the design, manufacturing, and processing are more troublesome.

  8. Anonymous users2024-02-08

    In ancient times, people lived on land and could not know the whole picture of the earth, so they thought that the land was mostly occupied and named the earth.

  9. Anonymous users2024-02-07

    Because but people are holding to the geocentric view.

  10. Anonymous users2024-02-06

    Using DNA polymerase activity, it mimics in vivo DNA reproduction.

    The process is empty. i.e. in primers.

    In the presence of primers, starting from the 3-terminal hydroxyl group of the primer, another chain of reverse complementation is used as a template, and the new strand is continuously polymerized.

  11. Anonymous users2024-02-05

    The optical system of the autocorrelation instrument is similar to the structure of the Michelson interferometer, the incident light pulse is divided into two beams of light through the beam splitter, and then reflected by the two prisms and then coaxial output again, so that the two same pulses produce a time difference, so that the two pulses interact in the frequency doubling crystal to produce a frequency doubling, so as to calculate the autocorrelation function of a pulse.

    frog: A time delay is introduced between two beams of light after passing through the beam splitter, and then the two beams are focused on a SHG doublet crystal, creating an interaction. The spectrum of the SHG signal in the area of the overlapping pulses is performed by a spectrometer and measured with a CCD to obtain a spatial pattern of the interacting light intensity as a function of frequency and time delay, called a frog trace. The pulse iteration algorithm is used to recover the amplitude and phase distribution of the pulse from the frog trace.

    The transient interaction between the replicated delayable pulse and the original pulse in a nonlinear medium is used as an optical switch. Spectral resolution of switching pulses over time.

    Frequency-resolved optical switching (frog) is more powerful than autocorrelation in that it can generate the full intensity and phase vs. time relationship of any pulse without making any assumptions about the pulse. Founder of SWAMPOPTICS ProfRick Trebino is one of the inventors of the frog technology, and his improved Grenouille can also be used to measure beam intensity distribution.

  12. Anonymous users2024-02-04

    The oscilloscope is a kind of image displayed after photoelectric conversion, which generally shows the real-time waveform of the pulse, but there is a little more troublesome is the response time, after all, the oscilloscope is an electrical device, and generally when the response is very short pulse, there will be problems, and even can not be detected, such as femtosecond laser pulses, at this time it is necessary to use the autocorrelator, but the autocorrelator is an optical device, the basic principle is to use the nonlinear effect of the frequency doubling crystal, so when detecting, it can give an accurate pulse width, But you can't judge how many pulses there are in this pulse width, for example, if you have a pulse of the order of two picoseconds, the direct interval time is dozens of femtoseconds, and some of the two pulses overlap, on the oscilloscope, you can see a pulse of picoseconds, but there are two small slits at the top, which means that it is a double pulse envelope, but with an autocorrelator, it is a pulse width, and the width is about the same as your pulse width, but, on the contrary, two pulses of the order of femtoseconds, the interval is picoseconds, The autocorrelator can be measured, but there may be no response at all on the oscilloscope, and there is no image, so before you measure, it is best to figure out by yourself that the pulse you want to measure is about that order of magnitude, whether there will be multiple pulses encompassing, my advice to you is to use the oscilloscope to see if there are multiple pulses, if not, use the autocorrelator to measure, in addition, the autocorrelator has a very troublesome place, that is, the dimming path, very, very troublesome, much more troublesome than the oscilloscope!

  13. Anonymous users2024-02-03

    Detection principle. The magnetic flux detector is based on the principle of electromagnetic induction, when the steel cord is excited by the sine wave current, the alternating magnetic field of the coil induces the current on the metal surface, and the induced current also produces a magnetic field of the same frequency opposite to the direction of the original magnetic field of Jinling, which is reflected to the probe coil, resulting in the change of resistance and inductance of the impedance of the detection coil. Therefore, when the probe encounters defects or changes in material and size, the reaction of the eddy current magnetic field on the coil is different, causing the coil to resist the change of the auspicious band, and the change can be identified by measuring the amount of change by the lead detection instrument to identify whether there are defects or other physical property changes on the surface of the steel cord.

Related questions
30 answers2024-08-04

Yao Ming is not for sale in the rocket; Kobe Bryant is not for sale for the Lakers; Paul is not for sale for the Hornets; Duncan is not for sale for the Spurs; James is not for sale for the Cavaliers; Howard is not for sale with the Magic; Wade is not for sale for the Heat; Garnett is not for sale for the Celts; Wait a minute.

45 answers2024-08-04

After reading this story, I was quite touched. It reminds me that I am very similar to your story. Maybe I think the boy has some last resort. I think you should talk to him.

7 answers2024-08-04

When Alyosha was three years old, he lost his father, and his mother fostered him with his maternal grandfather. When Alyosha came to her grandfather's house, her grandfather's business had already begun to decline, and Alyosha's two uncles were constantly quarreling and fighting over the division of the family and embezzling Alyosha's mother's dowry, and her grandfather became more and more tyrannical due to the recession of the family business. One day, out of curiosity, Alyosha threw a white tablecloth into a dye vat and dyed it blue, only to be beaten unconscious by her grandfather. >>>More

5 answers2024-08-04

When I was a child, it was too long. At that time, the holiday was really a holiday, first a few days of play, but there was a study group, you need to regularly go to the group leader's home school, the group leader supervised, sometimes the teacher let the homework be copied more than 2 times with two pens in the hand to write together, the faster the practice, the faster each other, and play after writing.

11 answers2024-08-04

Star card 39 yuan traffic version, 10G domestic general traffic and 30G directional traffic per month, domestic answering is free. Targeted traffic is used for applications, NetEase applications, Toutiao applications, vivo applications, Tencent**, iQiyi, Youku, Douyin, Kuaishou and other applications. Chasing dramas, brushing small **, listening to songs, watching**, news, navigation, etc.